linux-kernel - [PATCH][next] habanalabs/gaudi: Fix uninitialized return code rc when read size is zero

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Message-Id: <20210412161012.1628202-1-colin.king@canonical.com>
Date:   Mon, 12 Apr 2021 17:10:12 +0100
From:   Colin King <colin.king@...onical.com>
To:     Oded Gabbay <ogabbay@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ofir Bitton <obitton@...ana.ai>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] habanalabs/gaudi: Fix uninitialized return code rc when read size is zero

From: Colin Ian King <colin.king@...onical.com>

In the case where size is zero the while loop never assigns rc and the
return value is uninitialized. Fix this by initializing rc to zero.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 639781dcab82 ("habanalabs/gaudi: add debugfs to DMA from the device")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 8730b691ec61..b751652f80a8 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -6252,7 +6252,7 @@ static int gaudi_debugfs_read_dma(struct hl_device *hdev, u64 addr, u32 size,
 	dma_addr_t dma_addr;
 	void *kernel_addr;
 	bool is_eng_idle;
-	int rc, dma_id;
+	int rc = 0, dma_id;
 
 	kernel_addr = hdev->asic_funcs->asic_dma_alloc_coherent(
 						hdev, SZ_2M,
-- 
2.30.2